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(No Model.) 2 Shets--Sheet 1. I G. ZONCA & G. BELLA.

GRINDING MILL.

10 384,949. Patented June 19, 1888.

flzmzg 151mm N PETERS. Phmmm m. Washington. no.

(No Model.) 2' Sheets-Sheet 2.

G. ZONCA & GLBELLAQ GRINDING MILL.

No. 384,948. Patented June 19, 1888.

NITED STATES PATENT Guinea,

GAUDENZIO ZONCA AND GUISEPPE BELLA, OF VENICE, ITALY.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 384,949, dated J'une'19, 1888.

Application filed July 11, 1887. Serial No. 243,953. (No model.) Patented in Italy August 20, 1885, XXXVII, 101.

To all whom it may concern.-

Be it known that we, GAUDENZIO ZONGA and GUIsEPPE BELLA, citizens of the Kingdom of Italy, residing at Venice, in Italy, have invented certain new and useful Improvenientsin Grinding-Mills, and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon which form a part of this specification. I

In the drawings hereto annexed we have illustrated our improved grinding-mill, in Figure 1 by a side elevation partly in section, and in Fig. 2 by an end elevation.

The invention relates to grinding-mills em ployed for grinding various substances or materials, though we have confined the illustrations and description thereof to mills more especially designed for grinding cereals, and in which a revoluble grinding cylinder or drum operates in conjunction with a stationary concave to effect the reduction of the material; and it consists in the construction and arrangement of the grinding mechanism and means for adjusting the same, substantially as hereinafter fully described, and as set forth in the claim.

In the drawings, X indicates the main frame, of suitable construction for supporting the operative devices and for feeding the grain to the grinding mechanism.

On top of the frame is arranged the feedhopper 0, and within said hopper are arranged distributing devices of any desired construction to distribute the grain in an even sheet over the full length of the grinding devices.

In the drawings we have shown in dotted lines a distributingroller, 0, located in the discharge end of the feed-hopper 0, for the purpose of distributing the grain to the grinding mechanism.

In suitable bearings, I), in the main frame X is mounted the main shaft a, that carries a toothed or serrated grinding-cylinder, A, with which co-operates a correspondingly toothed or serrated concave, B, so arranged relatively to the grindingcylinder that the space be tween them is gradually reduced from the point at which the grain passes between the cylinder and concave to the point at which the ground material escapes from between them, as more plainly shown in Fig. 1.

The concave Bis jourualed in bearings b on the main frame, and its position relatively to the grinding-cylinder A is made adjustable in the following manner: In the main frame X are mounted two shafts, h and It. The shafth carries a pinion, m, and the shaft h. a pinion, m, that mesh with an intermediate idler, m, mounted on a short shaft, h, in said main frame, said short shaft having its end squared, as shown at s, for the application of a. crank.

0n the shaft h are secured two eccentrics, f, and on the shaft h two eccentrics,'g, whose straps or rods 0 c are pivoted to the concave B, as shown, and whereby the space between the concave and the cylinder A may be regulated or adjusted as desired for coarse and fine grinding.

TheconcaveB is of such size as to eucom pass about five-sixteenths of the periphery of the cylinder A, and its teeth orserratious are set in a direction the reverse of those on the grinding-cylinder, as will be readily understood. p

G is the discharge-chute; Z, the flywheel, which is removable from shaft a in Fig. 1; and Y is the main driving pulley that is mounted on said shaft a.

Motion is communicated from shaft a to the distributing-roll in the feed-hopper through the medium of a pulley, P, belted to said shaft a, and a pinion (not seen in the drawings) on shaft 1) of pulley P, which pinion meshes with a pinion, r, on the shaft or journal of the diso tributingroll O, and said pinion r meshes with an idler, r, as shown in Fig. 2.

We have found by experience that the op eration of grinding in the machine above described is more expeditious, that the losses are 5 not as great as in ordinary grinding-mills, that i the flour is not heated, but issues fromthe grinding mechanism in a cool state, and that the grain may be reduced to any desired degree of fineness.

IOO

Having now particularly described our inparts being arranged for co operation as and [O vention, what we claim isfor the purpose specified.

The 0Ombi112li1i0n,with the grinding-cylinder In testimony whereof we affix onr signatures A, of the concave B, the shafts h h, the eccenin presence of two witnesses.

5 tries f and g, the eccentric-straps c 0', pivoted GAUDENZIO ZONCA.

to the concave, the pinions m m, mounted on GUISEPPE BELLA. shafts h h, respectively, and the idler m", \Vitnesses: mounted on shaft h and gearing with pinions H. ABERT JOHNSON, m m, and means for rotating said shaft h", said l GUIsEPPE SARRI DALTARME. 

